Fix for issue #622
Fix for issue #622

The filters bundled with Octopress are not applied to files ending in 
`.md`, because the match in octopress_filters.rb does not match `.md`.
GilUpstream/docs,Aonepathan/docs,bogdanboss/docs,jacobmovingfwd/docs,hardikjain29/docs,Zaftula/docs,taz77/docs,Whatthefoxsays/docs,Aonepathan/docs,taz77/docs,L2G/docs,sendgrid/docs,Whatthefoxsays/docs,katieporter/docs,katieporter/docs,Zaftula/docs,hardikjain29/docs,awwa/docs,GilUpstream/docs,bogdanboss/docs,bogdanboss/docs,Ranhiru/docs,awwa/docs,taz77/docs,ksigler7/docs,Whatthefoxsays/docs,awwa/docs,jacobmovingfwd/docs,Ranhiru/docs,hardikjain29/docs,hardikjain29/docs,Ranhiru/docs,hardikjain29/docs,katieporter/docs,bogdanboss/docs,Ranhiru/docs,sendgrid/docs,jacobmovingfwd/docs,L2G/docs,L2G/docs,GilUpstream/docs,taz77/docs,GilUpstream/docs,Aonepathan/docs,Zaftula/docs,Ranhiru/docs,sendgrid/docs,jacobmovingfwd/docs,awwa/docs,ksigler7/docs,katieporter/docs,katieporter/docs,jacobmovingfwd/docs,awwa/docs,bogdanboss/docs,Zaftula/docs,L2G/docs,taz77/docs,L2G/docs,ksigler7/docs,Aonepathan/docs,GilUpstream/docs,Aonepathan/docs,Zaftula/docs